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Try this test, pull the spark plug wires off where it will not crank, hook your ohm meter to the battery crank over the engine keep turning over the engine for about 15 or 20 seconds, cut the key off and watch to see if the ohm meter needle moves back up toward 12v. If the needle drops below 9v +or- the starter or a connection may be at fault, if the batt doesn't move back toward 12v and then finally gets close to or at 12v the batt may be bad, weak, to small ( not high enough cranking amps). This test will only give you a idea of how your electrics are working, not to isolate a problem, unless of coarse the meter falls off drastically all of a sudden. This is a test taught in automotive class for years and will only ideas of where to further search for problems. I also meant to say you may want to try this test at different stages of battery strength. Good luck